JEE Main 2022ChemistryChemical KineticsEasyNumerical

JEE Main 2022 — Chemical Kinetics Question with Solution

JEE Main 2022 (25 Jul Shift 1)

Question

The half life for the decomposition of gaseous compound A is 240 s when the gaseous pressure was 500 Torr initially. When the pressure was 250 Torr, the half life was found to be 4.0 min. The order of the reaction is _____ (Nearest integer)

Enter your answer

Show full solutionCorrect answer: 1
Correct answer
1

Step-by-step explanation

t12500 torr=240sec=4 min

t12250 torr =4 min.

t12∝a1-n

t121t122=a1a21-n1=20=2505001-nn=1

As t12 is independent of initial pressure. Hence, order is 1st order.

Practice this on the real CBT interface

Solve this JEE Main question (and the rest of the Chemical Kinetics chapter) on PrepSharp's TCS iON-style CBT player — with timer, bookmarks and session analytics.

Solve interactively →

About this question

This is a previous-year question from JEE Main 2022, covering the Chemical Kinetics chapter of Chemistry. PrepSharp catalogues every PYQ from JEE Main with a verified answer key and step-by-step solution prepared by IIT alumni — so you can search by chapter, topic or year and revise efficiently.